America's Cup Mainsail Systems Revealed: Part 1
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- เผยแพร่เมื่อ 23 ส.ค. 2024
- America's Cup mainsail systems. Boom or boomless? Where are the hydraulics, what's a double skin and why have deck sweepers?
Part one we talk about the twin skin main sail the AC75 class rule, and then move on to discuss INEOS Team UK and Luna Rossa.
Next p we'll talk about ETNZ, another rule loophole and the possible systems to control the top of these huge AC75 rigs.
#MozzySails #AmericasCup #PradaCup
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Super insightful thanks both ☺️
Worth noting: all three sail packages supplied by North Sails. Regarding that lower zone (1.5m of the mainsail) where syndicates have design freedom to play with area, structure, geometry, shape and batten layout ... as JB Braun, North’s director of design and engineering states:
“It’s not just about the aerodynamic efficiency; it’s about the balanced efficiency of the system, because as you lower and raise your center of effort in the sail and your sail plan, it changes the side force the foils are seeing. So changing the side force changes your leeway or the lift distribution on the foil, which changes the drag of the foil, which then changes how much drive force you need. Then the aerodynamic part of it needs to change to account for that change in drive. It’s a coupled solution. You can look at these things independently, but to come up with an answer or an optimal shape, it’s a coupled solution for aero- and hydrodynamic.”
That why I believe this is a significant enabler for LR to point higher and have better upwind vmg (and pick her skirt up and foil earlier in light airs)
just wait for the video tomorrow on ETNZ...
A very insightful post. Do you 3 guys hope to be involved one day in an America’s cup campaign ? All the best.
Auckland. John.
I am not sure they do have better vmg anywhere.
@@johnandrews2853 well, I’d love to think you’re right about that John.
I’ve not studied beyond watching the races themselves but my impression has been there’s not much between them in the boat speeds upwind but LR points higher both after the tack and when she really needs to go higher (at the starts in particular) and that accounts for her better vmg (which for me looked like about around a full knot most of the time).
Downwind I believe Ineos has a slight edge on vmg but around half the LR upwind advantage.
@@Supasarge Mozzy's analysis is I think spot on.. Rita has the legs, but LR are able to gain many meters every tack - so their average VMG for the windward legs is, as you say, about 1Kt better. That dragging of the old (now windward) foil tip for a few seconds as their boat accelerates after each tack allows a quicker rotation (which should be draggy and slow) to be more than compensated for by much reduced leeway for the first few seconds after each tack.
As an ex-sailmaker, kudos. Another awesome video, can't wait to see the next parts...
Even with the tech issues, such an amazing video.
Your guys knowledge and ability to relay that knowledge to lay-people like me is brilliant - thanks so much guys!
On to tomorrows races - best of luck to both syndicates
Thanks for the great videos, I hope you'll dive into the new "Batwing" sail on Emirates Team New Zealand that it was spotted using recently...
Cheers,
Mo
Next video...
Watching everything you guys have researched and explained, and you are killing it, great thanks!
In my very humble opinion the clean line of the mainsail that is adherent to the profile of the deck give to Luna Rossa the advantage on light wind. The seal between deck and the mainsail improve the efficiency , I believe that is why LunaRossa going up to the foil easier than other boats, specially on light wind conditions.
Hope my English make sense.
Your English is excellent Alessandro (most Italian people’s English is far better than most British people’s Italian). And, I think you’re right ☺️
I'm a big fan of the boom less boats as well.
@@Supasarge Thank you!
Yes, I don't know very much but I agree with what you say. And it looks good!
Another awesome analysis, great work guys. Really appreciated!
complete newbie, but was already getting into the competition, your channel popped up on my feed and was instantly fascinated by the technical analysis, all spot on. And pleased to see the channel has had a few mentions in The Times. Brilliant stuff.
Thanks!
Interesting stuff, thanks for the insight/analysis. A Class Cats went to boomless, decksweeper mains a few years back. The shape of the sail is mainly controlled using mast bend (down haul on an A class and a little pre-set bend in the mast) and the main sheet that has some out-haul angle. Mast rotation is also important but less so as the apparent wind angles narrow both up and down wind.
More great insight, thx. The twin skin advantage has been experienced by windsurfers a long time back, I remember the huge difference in power when changing to a fully cambered sail for the first time even if it took a bit of extra effort to pop the cambers was required. Looking forward to part 2.
Thanks! I was waiting to hear about the differences in the sails. You are reading my mind!
Superb episode! It answered all the questions I had, particularly wrt the lack of a boom on the Italian boat. Thanks for putting this together.
Man your hair grows fast!
Well, you obviously have not watched the full video. Ha !
Please do this for my Laser sailor son sitting next to me watchings this in awe ;-) Epic breakdown. Superb as always.
As a land sailor (ones that sail on beaches at 60mph, and not sit in arm chairs) we are looking at the main sails very closely. The difficulty we have is not the bottom of the sail but the top quarter getting the twist correct. I have like the look of the Ineos mainsail the most, from the few shots of the complete rig. Smooth running is significant as jumping travellers will send waves up the rig.
yes, our running backstays are either tight on for windward or just on to stop them flying around loose so that makes sense.
Yes! The video I have been asking for in the comments!
I was thinking that maybe the very bottom of the main is less important too. I imagine that the air is moving more slowly and is more turbulent down there, close to the water and the boat's surfaces.
I thought it was hilarious when you outlined the top 4 metres of the mast, and it was such a tiny part of it. That's a large sail!
Yes they dwarf almost everything on the harbour, it makes them easy to spot. From a distance the boats don't look like much just a little insect but the wing now that is impressive! Not much is bigger out there other than the odd super yacht & container ships but none of those travel across the horizon like a low flying fighter jet. I going to miss them when the next America's Cup is sailed in Dubai :-(
@@cindyullsee393 I hadn't heard that the next America's Cup would be sailed in Dubai. Won't that depend on who wins this one? (I'm expecting NZ to win, but they might not!) Dubai would certainly be a sterile backdrop compared to the Hauraki Gulf.
I personally think the main's bottom zone is mainly going to be important at marginal foiling speeds and windspeeds: the more drive you can get low down, the less you load the leeward foil (because it is the sole source of righting moment to resist the heeling forces from the rig)
The last thing you want to be doing is apply extra downforce on the foil just when it's being asked to climb to the surface. But of course you do need forward drive, and lots of it.
I briefly wondered if this was also the rationale for the old-school-look, low aspect jibs, except they are not generally used in marginal foiling conditions, so it must be other considerations - maybe it frees up top zone of the main in respect of quick and effective alterations of the angle of attack to keep heel under fine control
... given that the triangle of support for the platform is the wrong way round (like a taildragging aircraft). This makes the boats naturally - and dangerously - inclined to heel more, the more they heel, because heeling (to leeward) effectively sheets the sails in. The AC50s did not suffer from this syndrome as their support was rectangular; the angle of attack of the sails was neutrally affected by heeling.
@@Gottenhimfella Certainly looks like the elegance of Luna Rossa's didn't hinder their Prada Cup victory.
Great analysis as usual, looking forward to the team NZ part.
On the boomless Luna Rossa setup, what's even more impressive is that it was conceived to run without backstays. One wonders how they could tension the rig.
They are adamant that having to put the stays back on was a great blow to their speed, as they create a lot of drag.
Great breakdown. Exactly what we need to know, the helicopter shots are enlightening as well. We have had the boom question since racing Formula 40 's in your backyard. Actually, Smyth designed a boomless stock main for a real competitive 3 man Stiletto 23 fleet before the 40's. That racing prepped us for Europe and we didn't even know it.
Manually, boomless is more trimming and little more strength required too. Our first 40 had a hydraulic boomless mainsheet. 16" bilge pump levers, leave a guy to leeward to pump like crazy and the windward one too.
Back in the U.S., Prosail 40"s were stock, but sails were ours and Randy's were the sweetest mains against the North's Ullman's, some others. I was built like a rugby player to handle manual main trim on very short courses. If we had a (little) guy done with a takedown, he could jump on the leeward winch too. I liked the speed and safety of a winch.
Fast forward, I get a hair up you know and decide to make a foiler of my Bimmare Javelin ht 18', now19'. Recut main to a boomless decksweeper, problem is with foiling you want a flatter main as speed picks up, when easing in a big puff, more camber is unavoidable. Our new smyth mainsail is perfect, depowers and trims effortlessly and has an expensive wishbone boom to reduce camber when easing, it is helping for sure. You built my very pretty, very fast white reacher from a Marstrom 20, the hoist is tall on the ht, sail is huge. New battened jib too.
Back to these boats, I kept telling Randy these mains are exceptional for their purpose and believe they are the secret to the boat design's success (mind boggling numbers) and are overlooked by the foils (by the audience ). I believe the shape is much better than a fixed chord camber wing mast, it and ultimately more shape control. The team's super computers may beg to differ of course. You are the first to dive on these amazing sails and their mysterious controls. The boom works well as you said, Ineos had a more consistent inner skin camber. But the Italians form follows function approach may be the elegant answer.
Bravo to my wonderful Italian friends. Sailing with Max, Shannon and family in Rolex and other regattas were just amazing times. The sailing is in English, the swearing is all Italian, which is great, you don't know if it was you that screwed up. If you did, you are sure to be embraced with love, forgiveness and enthusiasm.
Great comment, thanks for sharing!
@@MozzySails + 1
Great observations and explanations you two. Keep ‘em coming.
Glad to see that you are as enthralled as we are Michael. Jo is here loving the AC series, and says maybe see you in Island Roots for a coffee and mainsail debrief tomorrow! Thank you Mozzy Sails!
Ciao, complimenti per il canale molto interessante.
Voglio dire la mia sulla randa di LRPP, perchè secondo me nella vostra analisi non avete colto il vero punto di forza delle vele italiane.
Eliminando il boma con queste vele a doppia pelle son riusciti a creare delle vele in grado di assorbire e sfruttare le forze che si innescano nelle manovre, questo permette di riacquisire velocemente la forma ideale e ottimizzare i tempi di manovra, sopratutto nello stretto, questo si sta rivelando un vero punto di forza nelle manovre di partenza (oltre al doppio timoniere).
Il progetto di LRPP è stato incentrato su questi concetti di "randa portante" e l'intera barca è pensata per sfruttare questo. LRPP sarebbe in grado di navigare senza volanti riducendo di tanto il drag e andando ancora più forte
Mrwell besides giving his compliments to the channel, says that the lack of boom brings particular advantages in the maneuvers and starts, make shape changes faster and that the whole LR project was centered around this concept of "structural mainsail" and that were it not for the rule they could do away with backstays as well (not sure I think that is what "volanti" means).
@@AntonioPiccolboni Grazie Antonio, non volevo usare l'inglese per non essere frainteso, visto il mio livello, ma il concetto è quello. Si la volante sarebbe il paterazzo in inglese "backstays". Aggiungo inoltre che sui meccanismi e i sistemi che regolano la randa non credo abbiano grandi segreti o vantaggi quanto invece sulla struttura e i materiali veri e propri della randa e sulla sua concezione. In merito è interessante sentire l'intervista ad Andrea Casale reperibile su yt che spiega i nuovi concetti alla base del design delle vele per queste nuove barche.
Keep rocking them technicalities for us Mozzy. Thank you
Tnx Mozzy - fantastic show, fascinating discussion and expert analysis - plus nice relaxed vibe.
Fascinating analysis and for once I understood it all! Can't wait for Part II
Hi ! Another outstanding video. NZ is indebted to you and grateful for your educational inputs.
Auckland. John.
Thanks a lot for all the videos,
Great to have some English boffins commenting & explaining the AC75's, learnt a lot.
Actually hoping Ineos would win Prada cup as you deserve a break after 170 years or whatever it is.
Was in SF when Oracle made its comeback, cost me a bit being a kiwi but cant see a comeback for Ineos. Amazing what pressure does when you look back at BAR's mistakes.
Ben Ainslie says " we have to sail better "
I'd say he has to sail better as the starts are down to him. However not sure they are fast enough to keep LR behind in winds below 15knt. Maybe that's why he tried to force the hook.
Fastest boat without breakages or sinking wins in AC since I've I've been watching in Gretel 2 days.
Be surprised if it's any different this time but I was surprised in SF.
Hope they get 15knts+ Sat. but need a miracle.
Interesting as always. Comments on the summary about sail shape in the first 5 mins. I recall 35 years ago windsurfing sail manufacturers were addressing many of these issues; fully battened sails with an extended mast sleeve (partial twin skin) that effectively reduced drag and turbulence on the leeward side of the sail creating a much smoother airflow; sail foot increased to seal the sail to the deck of the board; sail head extended to increase sail size (sail shape much like the AC 75); batten shape inducing a more aerodynamic foil at the luff. So what's new? ;-)
Great video..!! Keep going Mozzy - this is really interesting and thoughtful commentary.
Dual skin soft mainsails on rotating D section masts are so much better than earlier wing concept. Fascinating to see detail of differing approaches to implementation. My understanding of "current rules" is that "active components" of trimming systems are limited to top and bottom third of sail ? ... Great stuff as usual !!
Loving the content.
You love sailing so much even your hair follow the wind like a sail
Another brilliant analysis. Thanks.
Absolutely awesome video. Really helped me understand. Thank you millions 👍👍👍👍
really guys you are AMAZING tnx sooo much for the explanation, are so interesting and nobody explain this kind of things 🙏
Great coverage guys. UI really appreciate it. One question. The mainsail on Luna Rossa is superb. With no boom the shape at the foot is a perfect shape. It meets the deck perfectly with no gap to seal off the end effect/losses. I cannot see how they stop the bunching up when they pull the Cunningham on hard to flatten the sail for upwind sailing. Maybe they pull the head up and down instead of having a Cunningham. What do you think?
“And that’s to stop people getting sneaky leverage gains by putting the mast lower down.” lol. That sounds like a challenge to me. ETNZ listening?
Great analysis guys ... keep up the good work!
i am practicing a sailing sport belonging to a “specific corner” of sailing: sand land yachting and ice boat. somehow very similar to foiling boat: low drag, high speed and thus very close apparent wind, down wind leg with apparent wind below 35 deg and so on. somes years ago we did try double skin sail, facing 2 issues: manage the cord lengh of each skin when the rotating mast angle change and control the sail trim and shape “single handed”. Finally we found the complexity of the sail control to high for single handed. I am also surprised that no sail maker are developing sail with “negativ leech”. at low apparent wind angle and medium/high wind, it is a easy way to control twist and overpower on a dynamic way. Imo better than the funny “bat wings”
That was really interesting. I expect you saw Matt Sheehan talking to Paul Goodison who gave some small insights and indication of loads. Look forward to the next one. Did you get Rob to cut your hair...😁
Yeah I saw that interview today! I was glad he didn't contradict me, especially as I have another video on mainsails coming out tomorrow! It was a great interview though and very insightful.
@@MozzySails Agreed, Matt is first class, sailed with him many moons ago in IOR days, a very nice chap.
Double skin sails are a great development that can be put into normal boats, albeit on larger yachts and I say that because the negative for a dingy is the extra weight and the mechanism to adjust two skins. The real advantage is you are able to produce a perfect aerofoil shape with control of the laminar flow and separation. They can in effect have the perfect glider wing in the vertical. The on,y thing they miss is a winglet on the head of the sail, one that can be hinged and moved to windward on each tack/gybe!!
One benefit not mentioned in this clip (unless I missed it) is the prevention of vortex shedding, which I presume is associated with the separation bubble (which they DO talk about). It seems to me this lets them keep control even when feathering the sail, in hurricane force winds. Anyone who has tried to nurse a boat through gusts with a single skin mainsail carrying too much sail at these wind strengths will know about how the rig can shake the boat like a terrier with a rat... not a great option. These sail/mast combos are even smoother and presumably less inclined to initiate turbulent flow than any of the wings I have seen to date on sailing vessels.
Excellent breakdown again.
It’s an educated guess but in the case of all marginal gains adding up I do think the better shape at the bottom of the mainsail on LR is helping and so it might not be big but it’s significant enough to help.
What I would say is the high mode probably comes from how LR can adjust the slot (between main and jib) and I also wonder if they are using the windward runner to temp put in extra mast rake... what do you think they do when LR goes into high mode ? For me this has significant advantage when starting and if needed at certain points on the course or in the close upwind match racing parts.
Hey Mozzy, I am doing a research paper on the America's Cup and was wondering where you got all of this data, the graphs, blueprints, etc for the hydrofoils and sails. I am hoping you see some of these comments and can point me the right direction. Thanks.
Brilliant explanation. Thanks!
Nearly, Luna Rosa does actually have a boom but it’s below the fairing on the deck. That’s why it can’t go all the way across the traveller
Great analisys, complimnets!
I think the yellow line for INEOS at 9:15 is following something that is not level. If you look at the other things on the sail, it does not look like more camber than LR to me.
Boom prevents camber control in the lower part of the sail, about half of the controllable lower 2 meters. That should hit them when the camber is max, that is maneuvers, getting onto the foils etc. but not in a straight line when sails are flattened out. Seems to fit previous mozzy sails analysis of race 3 or 4 where he showed they were gaining 10 meters over LR in a straight line only to lose 20 in the following tack.
Brilliant - thanks. INEOS seems to have a more responsive rig because of the boom; the question is how much of a benefit is that? There seems to be some benefit, but IMO the sailing tactics of the other team can neutralise that to some extent.
Errr. if no boom, 'outhaul' doesnt mean what we are used to? Outhaul imples tensioning the foot = compression in the boom. Maybe there is push or pull relative to the mainsheet attachment point(s)?
Yes, outhaul becomes more like clew board. However, not completely due to size and angle of clew board and presence of battens just above. However, onboard communications refer to 'outhaul' so I've kept that terminology.
Would love to read that study from the Southampton University on the effect of mast position and separation bubbles! Do you know how and where I could find it? Cheers, and thanks again for the awesome content!
Enjoy your videos. As the mast is rotating, how is this done given there is a spreader ? David R.
windsurfers don't use booms on the bottom like sail boats. they have them upper mainly to hold on to and provide outhaul
With having the hydraulic system for the main sail in the boat of luna rossa must be better in so many ways. The fact the weight of the system is lower in the boat unlike inios who ruun a boom and hide it in there, to even run a boom which adds weight and then adding the hydraulic for main sail in it higher up than inside the boat must cost speed, plus the boom and hydraulics swing from side to side where lunna rossa hydraulics for the main sail stay central and don't move. Only marginal gains but all adds up
Another brilliant one
Excellent video.
Outstanding... as you’re use to.
Excellent as ever 👍⛵️💨🇬🇧
Anyone know what the red square on LunaRossa deck are ? Is just esthetic or they have some functions? I tried to look on the web but I can’t find any information regarding. Thank you in advance.
No step areas.
Watching the end of the regattas you will notice that they take care not to step there. Look when they derig the main sail. th-cam.com/video/7exOFDI1mRA/w-d-xo.html
Italian design flair...
@@UgoMendesDonelli I see , thank you ! Now I am even more curious what there is under the deck .
Thanks for the video!
4-5m2 of excellent mainsail shape, right down at deck level - I'd call that a worthwhile advantage for LR. NZ's shape nearly, but not quite, as good. However NZ has a deck level camber adjustment device, to really force extra camber into the bottom of the main for more low down power when they want it.
For me the benefit for LR is reduced windage and less drag. With the fairings, 0.5kt boat speed advantage maybe...?
Not only can the kiwis proactively force extra camber, it seems to me they may be able to do it really quickly in comparison with more conventional systems. I speculate that this might allow them to "catch" the apparent wind vector, ie keep the flow attached rather than stalling the sail, in situations where the AWA shifts suddenly aft. Perhaps this helps them to keep foiling at lower windspeeds than the area of their foils would seem to support.
Conventional reactive systems (it seems to me) rely on the force of the wind normal to the sail chord overcoming the friction of the outhaul car, turning blocks, etc etc, to drag the car forward, at a time where (with the flow stalling) the available force is diminishing.
Of course this "catch" hypothesis also relies on the instincts of the trimmer alerting them early that extra camber may suddenly be required to preserve the angle of attack at the luff of the main. And the jib trimmer likewise....
@@Gottenhimfella Note that they use hydraulics to control all aspects of the mainsail - outhaul (including differential outhaul), cunningham, mainsheet etc etc.
@@maxhugen I thought that was probably the case. I also have a hunch that TNZ are using small hydraulic accumulators (I seem to recall the big ones are only allowed to be used for foil cant and flaps and rudder rake) which would explain why they are able to make such rapid adjustments of short duration.
@@Gottenhimfella I think you're probably correct, as they can't use the ones for foils, rudder etc. Certainly, when they are doing a lot of tacking, the grinders are going flat out! 😎
All good stuff but given that the Italians have a better sail plan, more aero deck layout, a better hull etc, why are the boat speeds alone so similar as how are the brits able to match their boat speed?
Great video, always enjoy these chats! A technical issue? Your hair and beard fell out at the end so it must have been taxing!! 😂
Nice analysis
Fascinating ! Why are Luna in a hurry ?
Nice video
Veri nice vid mozzy👍👍👍👍👍
Those grey lines are not hydraulic. They are far to taught for that, and there would be huge problems running stiff high pressure hoses to both move easy with the clew track and at the same time bend sharply up into the rig. The pipes will be going into the sail inside the mast or in the tack area where pipe flexion would be minimal. Flexible Hydraulic pipes are anything but flexible when they have pressure inside them.
Good comment and you could be right. I did think about that. ETNZ hydraulic hoses for the same outhaul mechanisms are of similar diameter (they can be seen when they de-rig). These aren't carrying the mainsheet load, just moving the clew position.
But, I also don't seen another alternative. How else would outhaul be changed?
@@MozzySails if they have a rigid plate in the clew then the ratio between leech and foot tension could be changed by moving the attachment point of the mainsheet. Or by moving the track back and forward but we know they do not do that.
@@johnandrews2853 Yes. the traveller track cannot be moving as the slot in the deck does not accommodate. That would also be visible in the stern cam footage.
So they must be adjusting the mainsheet attachment on the clew. On board they call this outhaul. If you pause the video at 0.42 you can see the interior of ETNZ main system with the dual hydraulic outhauls and connecting hoses. This is what I imagine is fed by the LR line from below deck.
But, I do share concern about the flex and ability to turn of such lines. Could also be electronic actuation.
There are some narrow nylon tubes that can carry pressure, but I thought hydraulic pressure is in the range of 2,000 psi. I would say some sort of small screw jack might be more likely. Perhaps the pressure to turn that could be less than a ram. It seems too complicated to me. Simpler is usually better.
@@MozzySails Electric wouldn't need two cables.
I expect them to be simple lines operating some sort of a lever to manipulate outhaul position - each side separate.
The other end of the line connected to a hydraulic ram itself sitting on top of the mainsheet ram gives you perfect delta operation with two lines - as said each side same system to be operated independently.
If I would have to design such a thing I would have thought such a path.
Do you have much on the hydraulics? I would imagine energy recovery would be huge, but I have no idea how this would be done.
Where is the libelous video about "another ETNZ's ingenious rule workaround"?🥝🥝🙏
4.30 GMT
I have a questions about future races of Prada Cup ?
1 When we will know about that ?
2 What would happened if one or more sailors get COVID now ? For ex. one of skippers , drivers or any other non muscle sailor ???
We will know at 4:30 p.m. NZ time. Bout the COVID I don’t know what the NZ government protocol dictates.
@@zaphodify Thank you
Race most likely Saturday NZ time. The weather looks like race will be on Bens favourite course if the Souwesterly arrives in time otherwise the winds possibly too light to race. Auckland weather can change rapidly, but two day forecasts are fairly accurate. AFAIK skipper would have to quarantine (not go to work) as would other close contacts until they get negative C virus test. Possibly Gov would exempt them for a race as the are fairly isolated on boat I think they would have to cross that bridge when they came to it.
if the boom is straight how does the sail get enough shape at the foot, ?
Two of the boats do not have booms, and at least one of those which did had an articulated boom
Why is no one making comments of the difference that the boom on Ineous and no boom on Prada.
There must be disturbance of the wind which impacts the pointing ability.
We will see what the drag affect on the rear of the mainsail on Team ENZ
So that's what you guys mean by "LR is such a pretty boat!" when compared to Rita? Yeah, the boom isn't as tidy, and the hull doesn't look like a dinghy. It looks like an airfoil, though...
I still like her. All you guys need now is 7:2. Worse odds happen all the time. To someone. I hope you guys can become those people.
Good luck.
I'd prefer 7-4 😉
@@Toob41 That would require a 7:0 from now on.
Thanks.
LR does have a boom under the deck
Having the hydraulics for trimming main sail under the deck in Luna rossa puts more weight lower down in the boat, isn’t that also better for weight distribution and center mass when under wind load?
yes it certainly is. They are limited by rules on where the CoG must be in the boats, but having it low gives them flexibility to put other stuff higher.
OK, got that. How do they sail downwind? The sail setup looks nothing like a convention sailing setup. It basically looks similar to sailing upwind or on a reach. Very curious.
Because the boats go so fast downwind, the apparent wind means that they must sheet in way more than on a conventional boat, and using off wind sails like spinnakers is unnecessary as they would add too much drag
A spinnaker or Genoa would never fly, unless they are in displacement mode.
@@tomknight5432 I understand that logic. So, what you are saying is that once the boat is flying it is the sail (Wing) that is propelling the boat forward? Ambient wind doesn't seam to be powering the sails to give enough forward "thrust". Am I on the right track?
@@fintanusa Fred
Take a pencil, paint a wind triangular with boat speed 3 times the wind speed.
You will find a course downwind with roughly similar apparent wind direction than going upwind.
Just the apparent wind is less intense- wich gives less aero resistance and less driving force.
The compensate with a bigger chamber in the sail to keep the driving force for the foils.
You got it? Roughly both directions to be sailed with the same sheet angle.
@@fintanusa you are mostly correct, but I would add that the true wind is still providing some of the drive, it’s just that the apparent wind is greater, so they must sheet in their sails more to prevent the sails luffing. Just to be clear true wind is the wind that you feel when stationary and apparent wind induced from moving through the air. Hope this helps 😀
What are your thoughts on Luna Rossa's attempt at using the excuse yoi cannot change the rules to prevent extending the racing schedule given they agreed to change the rules on maximum wind speed just days before the final..?
It's kind of the prerogative of the Challenger of record and defender. If the scoresheet was reversed the arguments definitely would flip too.
what video editing software do you use?
Comment on VPLP Oceanwings?
Am I the only person who thinks etnz have created all these rules with the loopholes already in mind?
Agree
No more discussion of American Magic now that they're out? Nothing interesting to analyze there?
Great video. Don't agree with your theory about the LR white hydraulic lines.
I can't find any evidence of these white lines not being under tension, same as mainsheet. Under tension is not a good idea for hyd. lines,. Hd. lines should have slack in them to deal with range of motion, and incidentals..
If they are hydraulic, then a entire system would have been developed to keep them tensioned, (as seen in video), easier to just to run hydraulic lines out between the sails from mast base. regardless of boom, or no boom. LR did work hard, not to have a boom, then to put hydraulic systems up in the sails seems counterproductive. Changing a mainsail, now you have to deal with swapping out hydraulic connections. Risky, even with quick disconnects, adding bulk and weight.
I agree your basic theory, that they are " outhaul" tension one for each mainsail/side.
They however are control lines that turn on the mainsheet traveler car. For each control line, there is a hydraulic cylinder, traveling with, lying parallel, same sheeting ratio, as mainsheet cylinders. With this you keep weights lower in boat., and eliminate complexities of running all hyd. up into sails.
I don't think those white lines are hydraulic lines. They seem too skinny but I suppose it is possible.
any racing tomorrow?
Rob looks like he's staying in a 1950s B&B.....
Double the aspect ratio?!
Where did the poster come from?
Parent's in law... or do you mean why did it appear randomly in the video?
@@MozzySails It's a foxy looking poster is all.
@@craiggreen1390 artist is Dave Thompson. You can find his work here: www.behance.net/gallery/29405005/Louis-Vuitton-Americas-Cup-2015
You don't like the new zealand main trimming system. What on earth would you know about the system my little expert!
HI did they not have twin skin sails 90 years ago in the America's cup ?
Some of your viewers may be interested in searching for 'AC75 aeroelastic' in TH-cam.....
cheers!
: ) r
Next Friday on race?
Absolutly Yes the lockdown is now grade 2 so this mean that is possible raceing with spectactors on boat but not in the ground. According the procedures signed by all the teams involve, the last day valid for finish the race is 24 febraury. So at the end of day 24 win automatically who got the best result nothing else.
@@adrianobonaldo8941 Has that been confirmed?
@@stelioskaragianis4539 Is part of the AC contract, the specifications and norms signed and approved by the teams so this is law. LR team want to respect the NZ lockdown this is sure, but in the middle of the sea there is no problem and everyone can easy wacth the race on tv like 99% of the fan in the world. I think the teams must carry on with races to get end in time. There are 3 case of Covid in NZ and with this numbers I dont thing is a big problem.
We will know it a 4:30 p.m. NZ time.
Wind surf sail use cambers for mor than 40 years
But ... Luna Rossa has a boom ... It's just under the deck
yes, and is made of magnets! In reality, their boom is under the deck, in that it's a traveller and hydraulic mainsheet rams
Talking about NZ you lost all your hair!
Did you get a hair cut, or not? When is the next race?
yeah... there's a handful of continuity errors in this video!
Lmao ETNZ with a genius rule work around, You sound salty 🤣😅🤣 Team NZ are just setting the standard, Magnets in the sail lmao
Gummon man you cant start talking about team nz then just end it....
WHAT!? THE UK ACTUALLY WINZ A RACE.
Sacrifice a penalty at the beginning and you have spittel on the ropes ?game of change? piss off that's not a win. Can the UK actually see ultrasonic or are we going to 2024 for that lesson?
Ultrasonic - sound that separates water into air to fly into - how hard can this be?
UK ignore this and be sorry 2 days and by by - ultrasonic breaks water got it!
those are not hydrolic lines. No way!
Perhaps inside protective aero tubes
If there’s lines they’ll be at other end of the boom. And they’ll be a larger gauge. Hydro pressure is immense. Less weight, less movement and shorter lines if they run hydro up by the mast. Hydro lines don’t come that thin for good reason, flow rates and pressure etc
first?
primo!
Leave your nit picking assumptions to inios thanks who are on a yellow card, please explain this if you can, oh!! You are making things sound desparate for 🇬🇧